submodule.c

   1 #include "cache.h"
   2 #include "submodule.h"
   3 #include "dir.h"
   4 #include "diff.h"
   5 #include "commit.h"
   6 #include "revision.h"
   7 #include "run-command.h"
   8 #include "diffcore.h"
   9 #include "refs.h"
  10 #include "string-list.h"
  11
  12 static struct string_list config_name_for_path;
  13 static struct string_list config_fetch_recurse_submodules_for_name;
  14 static struct string_list config_ignore_for_name;
  15 static int config_fetch_recurse_submodules;
  16
  17 static int add_submodule_odb(const char *path)
  18 {
  19         struct strbuf objects_directory = STRBUF_INIT;
  20         struct alternate_object_database *alt_odb;
  21         int ret = 0;
  22         const char *git_dir;
  23
  24         strbuf_addf(&objects_directory, "%s/.git", path);
  25         git_dir = read_gitfile_gently(objects_directory.buf);
  26         if (git_dir) {
  27                 strbuf_reset(&objects_directory);
  28                 strbuf_addstr(&objects_directory, git_dir);
  29         }
  30         strbuf_addstr(&objects_directory, "/objects/");
  31         if (!is_directory(objects_directory.buf)) {
  32                 ret = -1;
  33                 goto done;
  34         }
  35         /* avoid adding it twice */
  36         for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
  37                 if (alt_odb->name - alt_odb->base == objects_directory.len &&
  38                                 !strncmp(alt_odb->base, objects_directory.buf,
  39                                         objects_directory.len))
  40                         goto done;
  41
  42         alt_odb = xmalloc(objects_directory.len + 42 + sizeof(*alt_odb));
  43         alt_odb->next = alt_odb_list;
  44         strcpy(alt_odb->base, objects_directory.buf);
  45         alt_odb->name = alt_odb->base + objects_directory.len;
  46         alt_odb->name[2] = '/';
  47         alt_odb->name[40] = '\0';
  48         alt_odb->name[41] = '\0';
  49         alt_odb_list = alt_odb;
  50         prepare_alt_odb();
  51 done:
  52         strbuf_release(&objects_directory);
  53         return ret;
  54 }
  55
  56 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
  57                                              const char *path)
  58 {
  59         struct string_list_item *path_option, *ignore_option;
  60         path_option = unsorted_string_list_lookup(&config_name_for_path, path);
  61         if (path_option) {
  62                 ignore_option = unsorted_string_list_lookup(&config_ignore_for_name, path_option->util);
  63                 if (ignore_option)
  64                         handle_ignore_submodules_arg(diffopt, ignore_option->util);
  65         }
  66 }
  67
  68 int submodule_config(const char *var, const char *value, void *cb)
  69 {
  70         if (!prefixcmp(var, "submodule."))
  71                 return parse_submodule_config_option(var, value);
  72         else if (!strcmp(var, "fetch.recursesubmodules")) {
  73                 config_fetch_recurse_submodules = git_config_bool(var, value);
  74                 return 0;
  75         }
  76         return 0;
  77 }
  78
  79 void gitmodules_config(void)
  80 {
  81         const char *work_tree = get_git_work_tree();
  82         if (work_tree) {
  83                 struct strbuf gitmodules_path = STRBUF_INIT;
  84                 strbuf_addstr(&gitmodules_path, work_tree);
  85                 strbuf_addstr(&gitmodules_path, "/.gitmodules");
  86                 git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
  87                 strbuf_release(&gitmodules_path);
  88         }
  89 }
  90
  91 int parse_submodule_config_option(const char *var, const char *value)
  92 {
  93         int len;
  94         struct string_list_item *config;
  95         struct strbuf submodname = STRBUF_INIT;
  96
  97         var += 10;              /* Skip "submodule." */
  98
  99         len = strlen(var);
 100         if ((len > 5) && !strcmp(var + len - 5, ".path")) {
 101                 strbuf_add(&submodname, var, len - 5);
 102                 config = unsorted_string_list_lookup(&config_name_for_path, value);
 103                 if (config)
 104                         free(config->util);
 105                 else
 106                         config = string_list_append(&config_name_for_path, xstrdup(value));
 107                 config->util = strbuf_detach(&submodname, NULL);
 108                 strbuf_release(&submodname);
 109         } else if ((len > 23) && !strcmp(var + len - 23, ".fetchrecursesubmodules")) {
 110                 strbuf_add(&submodname, var, len - 23);
 111                 config = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, submodname.buf);
 112                 if (!config)
 113                         config = string_list_append(&config_fetch_recurse_submodules_for_name,
 114                                                     strbuf_detach(&submodname, NULL));
 115                 config->util = git_config_bool(var, value) ? (void *)1 : NULL;
 116                 strbuf_release(&submodname);
 117         } else if ((len > 7) && !strcmp(var + len - 7, ".ignore")) {
 118                 if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
 119                     strcmp(value, "all") && strcmp(value, "none")) {
 120                         warning("Invalid parameter \"%s\" for config option \"submodule.%s.ignore\"", value, var);
 121                         return 0;
 122                 }
 123
 124                 strbuf_add(&submodname, var, len - 7);
 125                 config = unsorted_string_list_lookup(&config_ignore_for_name, submodname.buf);
 126                 if (config)
 127                         free(config->util);
 128                 else
 129                         config = string_list_append(&config_ignore_for_name,
 130                                                     strbuf_detach(&submodname, NULL));
 131                 strbuf_release(&submodname);
 132                 config->util = xstrdup(value);
 133                 return 0;
 134         }
 135         return 0;
 136 }
 137
 138 void handle_ignore_submodules_arg(struct diff_options *diffopt,
 139                                   const char *arg)
 140 {
 141         DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
 142         DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 143         DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);
 144
 145         if (!strcmp(arg, "all"))
 146                 DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
 147         else if (!strcmp(arg, "untracked"))
 148                 DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
 149         else if (!strcmp(arg, "dirty"))
 150                 DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
 151         else if (strcmp(arg, "none"))
 152                 die("bad --ignore-submodules argument: %s", arg);
 153 }
 154
 155 static int prepare_submodule_summary(struct rev_info *rev, const char *path,
 156                 struct commit *left, struct commit *right,
 157                 int *fast_forward, int *fast_backward)
 158 {
 159         struct commit_list *merge_bases, *list;
 160
 161         init_revisions(rev, NULL);
 162         setup_revisions(0, NULL, rev, NULL);
 163         rev->left_right = 1;
 164         rev->first_parent_only = 1;
 165         left->object.flags |= SYMMETRIC_LEFT;
 166         add_pending_object(rev, &left->object, path);
 167         add_pending_object(rev, &right->object, path);
 168         merge_bases = get_merge_bases(left, right, 1);
 169         if (merge_bases) {
 170                 if (merge_bases->item == left)
 171                         *fast_forward = 1;
 172                 else if (merge_bases->item == right)
 173                         *fast_backward = 1;
 174         }
 175         for (list = merge_bases; list; list = list->next) {
 176                 list->item->object.flags |= UNINTERESTING;
 177                 add_pending_object(rev, &list->item->object,
 178                         sha1_to_hex(list->item->object.sha1));
 179         }
 180         return prepare_revision_walk(rev);
 181 }
 182
 183 static void print_submodule_summary(struct rev_info *rev, FILE *f,
 184                 const char *del, const char *add, const char *reset)
 185 {
 186         static const char format[] = "  %m %s";
 187         struct strbuf sb = STRBUF_INIT;
 188         struct commit *commit;
 189
 190         while ((commit = get_revision(rev))) {
 191                 struct pretty_print_context ctx = {0};
 192                 ctx.date_mode = rev->date_mode;
 193                 strbuf_setlen(&sb, 0);
 194                 if (commit->object.flags & SYMMETRIC_LEFT) {
 195                         if (del)
 196                                 strbuf_addstr(&sb, del);
 197                 }
 198                 else if (add)
 199                         strbuf_addstr(&sb, add);
 200                 format_commit_message(commit, format, &sb, &ctx);
 201                 if (reset)
 202                         strbuf_addstr(&sb, reset);
 203                 strbuf_addch(&sb, '\n');
 204                 fprintf(f, "%s", sb.buf);
 205         }
 206         strbuf_release(&sb);
 207 }
 208
 209 void show_submodule_summary(FILE *f, const char *path,
 210                 unsigned char one[20], unsigned char two[20],
 211                 unsigned dirty_submodule,
 212                 const char *del, const char *add, const char *reset)
 213 {
 214         struct rev_info rev;
 215         struct commit *left = left, *right = right;
 216         const char *message = NULL;
 217         struct strbuf sb = STRBUF_INIT;
 218         int fast_forward = 0, fast_backward = 0;
 219
 220         if (is_null_sha1(two))
 221                 message = "(submodule deleted)";
 222         else if (add_submodule_odb(path))
 223                 message = "(not checked out)";
 224         else if (is_null_sha1(one))
 225                 message = "(new submodule)";
 226         else if (!(left = lookup_commit_reference(one)) ||
 227                  !(right = lookup_commit_reference(two)))
 228                 message = "(commits not present)";
 229
 230         if (!message &&
 231             prepare_submodule_summary(&rev, path, left, right,
 232                                         &fast_forward, &fast_backward))
 233                 message = "(revision walker failed)";
 234
 235         if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
 236                 fprintf(f, "Submodule %s contains untracked content\n", path);
 237         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 238                 fprintf(f, "Submodule %s contains modified content\n", path);
 239
 240         if (!hashcmp(one, two)) {
 241                 strbuf_release(&sb);
 242                 return;
 243         }
 244
 245         strbuf_addf(&sb, "Submodule %s %s..", path,
 246                         find_unique_abbrev(one, DEFAULT_ABBREV));
 247         if (!fast_backward && !fast_forward)
 248                 strbuf_addch(&sb, '.');
 249         strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
 250         if (message)
 251                 strbuf_addf(&sb, " %s\n", message);
 252         else
 253                 strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
 254         fwrite(sb.buf, sb.len, 1, f);
 255
 256         if (!message) {
 257                 print_submodule_summary(&rev, f, del, add, reset);
 258                 clear_commit_marks(left, ~0);
 259                 clear_commit_marks(right, ~0);
 260         }
 261
 262         strbuf_release(&sb);
 263 }
 264
 265 void set_config_fetch_recurse_submodules(int value)
 266 {
 267         config_fetch_recurse_submodules = value;
 268 }
 269
 270 int fetch_populated_submodules(int num_options, const char **options,
 271                                const char *prefix, int ignore_config,
 272                                int quiet)
 273 {
 274         int i, result = 0, argc = 0;
 275         struct child_process cp;
 276         const char **argv;
 277         struct string_list_item *name_for_path;
 278         const char *work_tree = get_git_work_tree();
 279         if (!work_tree)
 280                 return 0;
 281
 282         if (!the_index.initialized)
 283                 if (read_cache() < 0)
 284                         die("index file corrupt");
 285
 286         /* 4: "fetch" (options) "--submodule-prefix" prefix NULL */
 287         argv = xcalloc(num_options + 4, sizeof(const char *));
 288         argv[argc++] = "fetch";
 289         for (i = 0; i < num_options; i++)
 290                 argv[argc++] = options[i];
 291         argv[argc++] = "--submodule-prefix";
 292
 293         memset(&cp, 0, sizeof(cp));
 294         cp.argv = argv;
 295         cp.env = local_repo_env;
 296         cp.git_cmd = 1;
 297         cp.no_stdin = 1;
 298
 299         for (i = 0; i < active_nr; i++) {
 300                 struct strbuf submodule_path = STRBUF_INIT;
 301                 struct strbuf submodule_git_dir = STRBUF_INIT;
 302                 struct strbuf submodule_prefix = STRBUF_INIT;
 303                 struct cache_entry *ce = active_cache[i];
 304                 const char *git_dir, *name;
 305
 306                 if (!S_ISGITLINK(ce->ce_mode))
 307                         continue;
 308
 309                 name = ce->name;
 310                 name_for_path = unsorted_string_list_lookup(&config_name_for_path, ce->name);
 311                 if (name_for_path)
 312                         name = name_for_path->util;
 313
 314                 if (!ignore_config) {
 315                         struct string_list_item *fetch_recurse_submodules_option;
 316                         fetch_recurse_submodules_option = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name);
 317                         if (fetch_recurse_submodules_option) {
 318                                 if (!fetch_recurse_submodules_option->util)
 319                                         continue;
 320                         } else {
 321                                 if (!config_fetch_recurse_submodules)
 322                                         continue;
 323                         }
 324                 }
 325
 326                 strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);
 327                 strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
 328                 strbuf_addf(&submodule_prefix, "%s%s/", prefix, ce->name);
 329                 git_dir = read_gitfile_gently(submodule_git_dir.buf);
 330                 if (!git_dir)
 331                         git_dir = submodule_git_dir.buf;
 332                 if (is_directory(git_dir)) {
 333                         if (!quiet)
 334                                 printf("Fetching submodule %s%s\n", prefix, ce->name);
 335                         cp.dir = submodule_path.buf;
 336                         argv[argc] = submodule_prefix.buf;
 337                         if (run_command(&cp))
 338                                 result = 1;
 339                 }
 340                 strbuf_release(&submodule_path);
 341                 strbuf_release(&submodule_git_dir);
 342                 strbuf_release(&submodule_prefix);
 343         }
 344         free(argv);
 345         return result;
 346 }
 347
 348 unsigned is_submodule_modified(const char *path, int ignore_untracked)
 349 {
 350         ssize_t len;
 351         struct child_process cp;
 352         const char *argv[] = {
 353                 "status",
 354                 "--porcelain",
 355                 NULL,
 356                 NULL,
 357         };
 358         struct strbuf buf = STRBUF_INIT;
 359         unsigned dirty_submodule = 0;
 360         const char *line, *next_line;
 361         const char *git_dir;
 362
 363         strbuf_addf(&buf, "%s/.git", path);
 364         git_dir = read_gitfile_gently(buf.buf);
 365         if (!git_dir)
 366                 git_dir = buf.buf;
 367         if (!is_directory(git_dir)) {
 368                 strbuf_release(&buf);
 369                 /* The submodule is not checked out, so it is not modified */
 370                 return 0;
 371
 372         }
 373         strbuf_reset(&buf);
 374
 375         if (ignore_untracked)
 376                 argv[2] = "-uno";
 377
 378         memset(&cp, 0, sizeof(cp));
 379         cp.argv = argv;
 380         cp.env = local_repo_env;
 381         cp.git_cmd = 1;
 382         cp.no_stdin = 1;
 383         cp.out = -1;
 384         cp.dir = path;
 385         if (start_command(&cp))
 386                 die("Could not run git status --porcelain");
 387
 388         len = strbuf_read(&buf, cp.out, 1024);
 389         line = buf.buf;
 390         while (len > 2) {
 391                 if ((line[0] == '?') && (line[1] == '?')) {
 392                         dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
 393                         if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
 394                                 break;
 395                 } else {
 396                         dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
 397                         if (ignore_untracked ||
 398                             (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
 399                                 break;
 400                 }
 401                 next_line = strchr(line, '\n');
 402                 if (!next_line)
 403                         break;
 404                 next_line++;
 405                 len -= (next_line - line);
 406                 line = next_line;
 407         }
 408         close(cp.out);
 409
 410         if (finish_command(&cp))
 411                 die("git status --porcelain failed");
 412
 413         strbuf_release(&buf);
 414         return dirty_submodule;
 415 }
 416
 417 static int find_first_merges(struct object_array *result, const char *path,
 418                 struct commit *a, struct commit *b)
 419 {
 420         int i, j;
 421         struct object_array merges;
 422         struct commit *commit;
 423         int contains_another;
 424
 425         char merged_revision[42];
 426         const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
 427                                    "--all", merged_revision, NULL };
 428         struct rev_info revs;
 429         struct setup_revision_opt rev_opts;
 430
 431         memset(&merges, 0, sizeof(merges));
 432         memset(result, 0, sizeof(struct object_array));
 433         memset(&rev_opts, 0, sizeof(rev_opts));
 434
 435         /* get all revisions that merge commit a */
 436         snprintf(merged_revision, sizeof(merged_revision), "^%s",
 437                         sha1_to_hex(a->object.sha1));
 438         init_revisions(&revs, NULL);
 439         rev_opts.submodule = path;
 440         setup_revisions(sizeof(rev_args)/sizeof(char *)-1, rev_args, &revs, &rev_opts);
 441
 442         /* save all revisions from the above list that contain b */
 443         if (prepare_revision_walk(&revs))
 444                 die("revision walk setup failed");
 445         while ((commit = get_revision(&revs)) != NULL) {
 446                 struct object *o = &(commit->object);
 447                 if (in_merge_bases(b, &commit, 1))
 448                         add_object_array(o, NULL, &merges);
 449         }
 450
 451         /* Now we've got all merges that contain a and b. Prune all
 452          * merges that contain another found merge and save them in
 453          * result.
 454          */
 455         for (i = 0; i < merges.nr; i++) {
 456                 struct commit *m1 = (struct commit *) merges.objects[i].item;
 457
 458                 contains_another = 0;
 459                 for (j = 0; j < merges.nr; j++) {
 460                         struct commit *m2 = (struct commit *) merges.objects[j].item;
 461                         if (i != j && in_merge_bases(m2, &m1, 1)) {
 462                                 contains_another = 1;
 463                                 break;
 464                         }
 465                 }
 466
 467                 if (!contains_another)
 468                         add_object_array(merges.objects[i].item,
 469                                          merges.objects[i].name, result);
 470         }
 471
 472         free(merges.objects);
 473         return result->nr;
 474 }
 475
 476 static void print_commit(struct commit *commit)
 477 {
 478         struct strbuf sb = STRBUF_INIT;
 479         struct pretty_print_context ctx = {0};
 480         ctx.date_mode = DATE_NORMAL;
 481         format_commit_message(commit, " %h: %m %s", &sb, &ctx);
 482         fprintf(stderr, "%s\n", sb.buf);
 483         strbuf_release(&sb);
 484 }
 485
 486 #define MERGE_WARNING(path, msg) \
 487         warning("Failed to merge submodule %s (%s)", path, msg);
 488
 489 int merge_submodule(unsigned char result[20], const char *path,
 490                     const unsigned char base[20], const unsigned char a[20],
 491                     const unsigned char b[20])
 492 {
 493         struct commit *commit_base, *commit_a, *commit_b;
 494         int parent_count;
 495         struct object_array merges;
 496
 497         int i;
 498
 499         /* store a in result in case we fail */
 500         hashcpy(result, a);
 501
 502         /* we can not handle deletion conflicts */
 503         if (is_null_sha1(base))
 504                 return 0;
 505         if (is_null_sha1(a))
 506                 return 0;
 507         if (is_null_sha1(b))
 508                 return 0;
 509
 510         if (add_submodule_odb(path)) {
 511                 MERGE_WARNING(path, "not checked out");
 512                 return 0;
 513         }
 514
 515         if (!(commit_base = lookup_commit_reference(base)) ||
 516             !(commit_a = lookup_commit_reference(a)) ||
 517             !(commit_b = lookup_commit_reference(b))) {
 518                 MERGE_WARNING(path, "commits not present");
 519                 return 0;
 520         }
 521
 522         /* check whether both changes are forward */
 523         if (!in_merge_bases(commit_base, &commit_a, 1) ||
 524             !in_merge_bases(commit_base, &commit_b, 1)) {
 525                 MERGE_WARNING(path, "commits don't follow merge-base");
 526                 return 0;
 527         }
 528
 529         /* Case #1: a is contained in b or vice versa */
 530         if (in_merge_bases(commit_a, &commit_b, 1)) {
 531                 hashcpy(result, b);
 532                 return 1;
 533         }
 534         if (in_merge_bases(commit_b, &commit_a, 1)) {
 535                 hashcpy(result, a);
 536                 return 1;
 537         }
 538
 539         /*
 540          * Case #2: There are one or more merges that contain a and b in
 541          * the submodule. If there is only one, then present it as a
 542          * suggestion to the user, but leave it marked unmerged so the
 543          * user needs to confirm the resolution.
 544          */
 545
 546         /* find commit which merges them */
 547         parent_count = find_first_merges(&merges, path, commit_a, commit_b);
 548         switch (parent_count) {
 549         case 0:
 550                 MERGE_WARNING(path, "merge following commits not found");
 551                 break;
 552
 553         case 1:
 554                 MERGE_WARNING(path, "not fast-forward");
 555                 fprintf(stderr, "Found a possible merge resolution "
 556                                 "for the submodule:\n");
 557                 print_commit((struct commit *) merges.objects[0].item);
 558                 fprintf(stderr,
 559                         "If this is correct simply add it to the index "
 560                         "for example\n"
 561                         "by using:\n\n"
 562                         "  git update-index --cacheinfo 160000 %s \"%s\"\n\n"
 563                         "which will accept this suggestion.\n",
 564                         sha1_to_hex(merges.objects[0].item->sha1), path);
 565                 break;
 566
 567         default:
 568                 MERGE_WARNING(path, "multiple merges found");
 569                 for (i = 0; i < merges.nr; i++)
 570                         print_commit((struct commit *) merges.objects[i].item);
 571         }
 572
 573         free(merges.objects);
 574         return 0;
 575 }